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ABSTRACT
The lecithin concentration and temperature effects on the Theological behavior of two linear sodium alkyl-ether-sulfate with different average ethoxylation grade (2.3 and 3.1 moles of ethylene oxide) has been studied.
Experimental results show:
the addition of lecithin causes higher increases of dynamic viscosity in the systems prepared with the alkyl-ether-sul fate which presents less ethoxylation grade.
all the systems prepared with the alkyl-ether-sulfate which contents 3.1 mole of ethylene oxide show newtonian Theological behavior. However, some of the systems prepared with the other alkyl-ether-sulfate show non-newtonian Theological behavior (pseudoplastic or viscoelasic)